If you have a line of type highlighted, you can easily change the alignment using keyboard shortcuts:
Command Shift L (PC: Cntl Shift L) to Align Left
Command Shift C (PC: Cntl Shift C) to Align Center (Canadian: Centre)
Command Shift R (PC: Cntl Shift R) to Align Right
PS. Why was I the only one in my office yesterday? Just kidding - Happy 4th to all you U.S folks.